Log Message:
py-numexpr: updated to 2.8.5

Changes from 2.8.4 to 2.8.5
---------------------------

* A `validate` function has been added. This function checks the inputs, returning
  `None` on success or raising an exception on invalid inputs. This function was
  added as numerous projects seem to be using NumExpr for parsing user inputs.
  `re_evaluate` may be called directly following `validate`.
* As an addendum to the use of NumExpr for parsing user inputs, is that NumExpr
  calls `eval` on the inputs. A regular expression is now applied to help sanitize
  the input expression string, forbidding '__', ':', and ';'. Attribute access
  is also banned except for '.r' for real and '.i'  for imag.
* Thanks to timbrist for a fix to behavior of NumExpr with integers to negative
  powers. NumExpr was pre-checking integer powers for negative values, which
  was both inefficient and causing parsing errors in some situations. Now NumExpr
  will simply return 0 as a result for such cases. While NumExpr generally tries
  to follow NumPy behavior, performance is also critical.
* Thanks to peadar for some fixes to how NumExpr launches threads for embedded
  applications.
* Thanks to de11n for making parsing of the `site.cfg` for MKL consistent among
  all shared platforms.